Questions tagged [electrochemistry]

The branch of chemistry that deals with the study of redox reactions and how they can be applied to generate electricity (in electrochemical cells) and to carry out non-spontaneous reactions using electricity (electrolysis).

258 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
0
votes
0answers
19 views

Electrodes of the second kind

An electrode of the second kind consists of a metal sheet coated with a layer of a slightly soluble salt of the metal of which it is made, immersed in an electrolytic solution: the last one must have ...
0
votes
0answers
33 views

half equations for a lead-acid cell

we are learning about galvanic cells. I would like to know the half equations and overall equation that occurs in this lead acid cell. so far my understanding for the oxidisation section is that in a ...
0
votes
0answers
23 views

Negative Voltage for Full Redox Reaction?

I have a question about voltages including redox reactions. I know that half equations may have negative voltages when choosing what is undergoing reduction, and what is undergoing oxidation in a ...
0
votes
0answers
33 views

Can I make an ionic liquid from glycerin and zinc sulfate?

Can I make an ionic liquid (dissolved salt without water) by combining zinc sulfate and glycerin? I've been using 1 M $\ce{ZnSO4}$ as my electrolyte in supercapacitor study. Works very well up to ...
0
votes
0answers
47 views

Regarding Standard Electrode Potentials

If the standard hydrogen electrode (SHE) is set arbitrarily to have a potential that is equal to 0 V, and has an absolute real potential. Then, in electrochemistry, how are the electrode potentials of ...
0
votes
1answer
93 views

Does reduction/ oxidation take place separately at a half cell electrode?

In the redox reaction chapter, we learn that oxidation and reduction go hand in hand. The oxidising agent oxidises by accepting the electron released by the reducing agent and gets reduced in the ...
0
votes
0answers
48 views

Where does copper form?

I thought zn and cu both lose 2e- to pt but someone is telling me it's wrong]
0
votes
0answers
25 views

What is the reasoning behind deriving electrode potential of a metal-metal sparingly soluble salt electrode?

Considering a sparingly soluble salt $M_xN_y$ of the metal $M$, in which the corresponding reaction is $M_xN_y$ = $xM^{y+}$ + $yN^{x-}$, the standard electrode potential is given by $E^{o}_{M_xN_y/M/...
0
votes
0answers
30 views

Can CO2 Be Electrochemically Reduced to Carbon Nanotubes?

Mitigation of CO2 as greenhouse gas has driven increasing investigation of its chemical reduction. The 2018 paper "Recent Progress in the Theoretical Investigation of Electrocatalytic Reduction of CO2"...
0
votes
0answers
18 views

Solutions when Electroplating

I'm essentially conducting an experiment to see whether using different copper-based compounds when electroplating copper onto an iron nail would give different results. So far, I've used copper ...
0
votes
0answers
118 views

Difference between electrode potential and standard electrode potential

I was studying electrochemistry but the thing that confused me was that what is the basic difference between electrode potential and standard electrode potential?
0
votes
0answers
54 views

Why do reference electrodes have porous frits or membranes as a salt bridge?

From what I understand, they act as a salt bridge between the reference electrode electrolyte and the analyte solution (in a potentiometric titration). But why do we use partially permeable membranes ...
0
votes
0answers
35 views

Theoretical Calculations for Potential Generated in Salt Water Battery

I am using a $\pu{1.5 M}~\ce{KCl}$ solution as electrolyte and copper and aluminium electrodes but no salt bridge. So basically there is only one beaker with the two electrodes in it with the $\pu{1.5 ...
0
votes
3answers
83 views

How Can I Induce Corrosion Electrochemically?

I'm very interested in measuring corrosion in metal alloys, particularly in salt solutions. I understand metals corrode over time, however, I was wondering if it's possible to electrochemically "speed ...
0
votes
0answers
36 views

Is it possible to convert a combustion reaction directly into an electrochemical one?

I'm fairly inexperienced in chemistry so forgive me if this question is silly but, why is it not possible to convert a combustion reaction to an electrochemical one directly and harvest the electrical ...
0
votes
1answer
218 views

Do We change sign of electrode potential when reversing an equation?

I have a cell equation as: $$\ce{2Cr^0 + 3Cd^2+ -> 2Cr^3+ + 3Cd^0}$$ I am provided the standard reduction potentials as: $$\begin{align}\ce{Cd^2+ + 2e- &-> Cd} && E= \pu{-0.4V}\...
0
votes
0answers
172 views

Half-reaction for ammonium nitrate comproportionation into dinitrogen monoxide.

Ammonium nitrate comproportionates into dinitrogen monoxide in the following reaction: $\ce{NH4+ (aq) + NO3- (aq) -> N2O(g) + 2H2O (l)}$ I attempted to write the half-reactions by calculating ...
0
votes
3answers
95 views

Is it possible to generate electricity by using two inert electrodes in a galvanic cell?

The Daniell cell has two active electrodes, meaning that both the copper and the zink electrodes participate in the redox reaction. However, in a lemon battery for example, the copper electrode is ...
0
votes
1answer
53 views

Current in a Lithium Ion Battery

I am trying to find the current transferred to the anode and cathode of a Lithium Ion Battery at different voltages. I know the temperature (approximately) of the battery, the battery's starting ...
0
votes
0answers
642 views

Why do the Metal Ions in an Electrochemical Cell Not Pass Through a Salt Bridge?

I understand that the purpose of a salt bridge is to maintain the neutrality of the solutions in an electrochemical cell, but why do the ions being oxidized and reduced not pass through the salt ...
0
votes
0answers
87 views

Does electroplating fall off if I disconnect electrolytic cell?

So I understand the basic mechanism of electroplating. I want to ask is there any chance that the electroplating may fall off if I disconnect the electricity supply? As a consequence, should I ...
0
votes
0answers
88 views

Electroplating an iPhone

I thought it would be cool to electroplate the rear case of an iPhone 6 or newer since it's made out of aluminum. It's been a long time since I learned about the topic, so I looked online to research ...
0
votes
0answers
87 views

Will OH- ions be reduced or H+ ions be reduced in KOH electrolyte

I was trying to see if I can make a battery that uses KOH as the cathode electrolyte with platinum as the cathode electrode, but I got confused as to what gets reduced in this solution (Aluminum ...
0
votes
0answers
257 views

Reduction of potassium ion and hydrogen ion

I am studying a galvanic cell, and the cathode uses potassium hydroxide as its electrolyte. I am getting confused as to what gets reduced when electrons come from the anode. I believe it would be the ...
0
votes
0answers
483 views

Concentration of gas phase in Nernst equation

What if one or both electrodes are in gas phase? Use PV=nRT? Also the definition of hydrogen electrode gets a little sketchy if we use PV=nRT to write it's concentration, the electrode potential doesn'...
0
votes
0answers
44 views

How can two same reactions have a different reduction potential

According to wikipedia the reduction of AgCl (s) to give Ag (s) and $Cl^-$ (aq) has reduction potential of 0.22 V . But it also says tha the reduction of $Ag^+$ (aq) to give Ag (s) has reduction ...
0
votes
0answers
130 views

Proof of Concentration dependence of molar conductivity

If we go by the simple electron model, Conductivity/Concentration=carrier charge*mobility and mobility is only dependent on temperature for electrons. My question is regarding strong electrolyte, I ...
0
votes
0answers
149 views

Can't a redox reaction occur in one half cell alone without flowing through the external circuit?

Say you have two half cells. The electrolytes are connected by a salt bridge and the electrodes by a wire. Half cell 1’s electrolyte is copper(II) nitrate and its electrode is solide copper. Half ...
0
votes
0answers
148 views

Adding reduction potentials?

Will it be wrong to add reduction potentials of two intermediate reactions to get reduction potential of net reaction(just like as we do in adding enthalpies and applying Hess's law)? What is the ...
0
votes
0answers
1k views

Why are potential electrolytes poor conductors in the pure liquid state?

In my textbook, "In the pure liquid state, a true electrolyte is a good conductor of electricity. In contrast, a potential electrolyte is a poor conductor in the pure liquid state." definitions "A ...
0
votes
0answers
193 views

Inert in Cathode when Electrolysis

Why Platinum, Gold, Carbon are inert? In electrolysis, it's not react in anode because anode is doing oxidizing, but how about cathode? Are they still inert?
0
votes
0answers
56 views

Electroplating reaction

In electroplating, can a galvanic cell substitute the direct current supply? The process is to change iron metal to a silver one, but a galvanic cell is connected to the two electrodes.
0
votes
0answers
187 views

What is the purpose of the solution in a galvanic cell?

In other words: What is the purpose of the solution that the electrodes are immersed in, in a galvanic cell, and is it possible to generate a current without any solution?
0
votes
0answers
697 views

Concentration cell lower half cell concentration from measured cell potential

I am trying to find the Ksp of silver thiocyanate: AgSCN(s) --> Ag+ (aq)SCN-(aq) but I need to first prove that the lower [Ag+] = 1.27-12 M, but don't know how to find it. The data I am given: ...
0
votes
0answers
240 views

The feasibility of the electrochemical cell.

This is the question extracted from my country high school level' exam. So it asks to discuss the feasibility of the electrochemical cell to carry out electrolysis of an aqueous solution of sodium ...
0
votes
0answers
67 views

How is streaming potential measured?

This paper describes the measurement of streaming potential using a potential divider configuration. However it is unclear where the potential difference is created. From the diagram it appears that ...
0
votes
1answer
1k views

Salt bridge in galvanic cell

When we make a galvanic cell using zinc rod (in zinc sulphate solution) and copper rod (in copper sulphate solution), there is a flow of sulphate ions from the copper compartment to the zinc ...
-1
votes
0answers
23 views

Are high energy-density rechargeable batteries possible with all reactants in the vapor phase, making them light-weight?

Is anyone working on rechargeable batteries whose components are purely in gaseous state except for their casing, i.e their energy-density being greater than or equal to the best batteries we have (Li-...
-1
votes
0answers
25 views

Calculate Delta H from difference in Cell Potentials

The entropy change of a cell reaction can be determined from the change of the cell potential with temperature. Calculate $\Delta S$ and $\Delta H$ for the cell reaction $\ce{Hg2Cl2(s) + H2(g) -> ...
-1
votes
1answer
35 views

Why electrons move to Cu in galvanic cells?

I'm student who learning about chemistry, and I got problem about understanding why electorns move to Cu in galvanic cells. Let's think the reason for electrons going to Cu is that the standard ...
-1
votes
1answer
39 views

What drives the redox reactions in a standard hydrogen electrode?

In this video, the SHE half cell has two redox reactions occurring i.e. $$\ce{2H+ (g) + 2e- <=> H2 (g)}\\ \ce{H2 (g) <=> 2H+ (g) + 2e-}$$ But how can a single half cell initiate the two ...
-1
votes
1answer
3k views

Does the concentration affect the voltage in electrochemistry

Hello for my final chemistry lab we are doing electrochemistry. For my independent lab I'm using 10mL of ZnSO4 and 10mL of CuSO4. Then connect them with a salt bridge. I connect Zn metal and Cu metal ...
-1
votes
1answer
284 views

Galvanic/Voltaic Cell: Does Cell Voltage Change When A Resistor Is Connected?

I tried making a lead acid battery. After charging for about 10 minutes, I connect the voltmeter in parallel to the cell and see that there is around a 1.2V (which is quite lower than what I predicted)...
-1
votes
2answers
311 views

How connecting galvanic batteries in series actually works. “In Series” detection experiment

How I am interested in understanding what is the actual mechanism behind increasing potential in simple galvanic cell connected in series. Almost all explanations I found on internet are more like ...
-1
votes
1answer
1k views

Why is the standard reduction potential of an anode negative in a galvanic cell?

It makes not intuitive sense to me why something can have a negative voltage , I understand the concept of voltage drop , but voltage is not being dropped in the anode so why would it be negative ?
-1
votes
1answer
857 views

How does electrolytic conduction depends on the size of ions & their solvation?

The textbook says, The smaller the effective size of the ion after solvation, the greater will be its conducting power." But, on the Internet, it is explained as follows: Radius decreases, ...
-1
votes
1answer
276 views

In a galvanic cell from where does the electron in the external circuit come from?

I know that in a galvanic cell anode donates electrons through the external circuit. Is that the same electrons that the electrolyte gives it ?
-1
votes
1answer
208 views

Why do we talk about hydrogen evolution for the corrosion of aluminum?

During the corrosion of aluminum, we have the oxidation of aluminum to its ionic form and this reaction is balanced by a reduction of ions in solution. So basically it is the reduction of $\ce{H+}$ ...
-1
votes
2answers
420 views

How do galvanic cells work?

I was wondering how a galvanic cell works If you look at the picture below, if I have magnesium metal in sulfuric acid, will the metal react with the acid to be then turned into magnesium ions and in ...
-1
votes
1answer
43 views

Can a galvanic electrochemical cell produce current only one time without a salt bridge?

I think that galvanic cell produce current only one time without salt bridge. Potentional difference of both the electrodes are different and the electrons flow till their difference becomes same.Salt ...